/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory;

import org.springframework.beans.FatalBeanException;
import org.springframework.lang.Nullable;

/**
 * Exception thrown when the BeanFactory cannot load the specified class
 * of a given bean.
 *
 * @author Juergen Hoeller
 * @since 2.0
 */
@SuppressWarnings("serial")
public class CannotLoadBeanClassException extends FatalBeanException {

    @Nullable
    private final String resourceDescription;

    private final String beanName;

    @Nullable
    private final String beanClassName;


    /**
     * Create a new CannotLoadBeanClassException.
     *
     * @param resourceDescription description of the resource
     *                            that the bean definition came from
     * @param beanName            the name of the bean requested
     * @param beanClassName       the name of the bean class
     * @param cause               the root cause
     */
    public CannotLoadBeanClassException(@Nullable String resourceDescription, String beanName,
                                        @Nullable String beanClassName, ClassNotFoundException cause) {

        super("Cannot find class [" + beanClassName + "] for bean with name '" + beanName + "'" +
                (resourceDescription != null ? " defined in " + resourceDescription : ""), cause);
        this.resourceDescription = resourceDescription;
        this.beanName = beanName;
        this.beanClassName = beanClassName;
    }

    /**
     * Create a new CannotLoadBeanClassException.
     *
     * @param resourceDescription description of the resource
     *                            that the bean definition came from
     * @param beanName            the name of the bean requested
     * @param beanClassName       the name of the bean class
     * @param cause               the root cause
     */
    public CannotLoadBeanClassException(@Nullable String resourceDescription, String beanName,
                                        @Nullable String beanClassName, LinkageError cause) {

        super("Error loading class [" + beanClassName + "] for bean with name '" + beanName + "'" +
                (resourceDescription != null ? " defined in " + resourceDescription : "") +
                ": problem with class file or dependent class", cause);
        this.resourceDescription = resourceDescription;
        this.beanName = beanName;
        this.beanClassName = beanClassName;
    }


    /**
     * Return the description of the resource that the bean
     * definition came from.
     */
    @Nullable
    public String getResourceDescription() {
        return this.resourceDescription;
    }

    /**
     * Return the name of the bean requested.
     */
    public String getBeanName() {
        return this.beanName;
    }

    /**
     * Return the name of the class we were trying to load.
     */
    @Nullable
    public String getBeanClassName() {
        return this.beanClassName;
    }

}
